English French German Italian Portuguese Spanish Swedish

 

Disconnected Spark Plugs

  • DHeal
  • DHeal's Avatar Topic Author
  • Offline
  • Expert Boarder
  • Expert Boarder
More
9 months 2 days ago #18496 by DHeal
Disconnected Spark Plugs was created by DHeal
It is my understanding that one should not rotate the crankshaft on a 912 ULS when the spark plug wires are not connected to the spark plugs -- doing so could damage the ignition modules. Is this also true if the ignition switches are in the OFF position?

Please Log in or Create an account to join the conversation.

  • Bill Hertzel
  • Bill Hertzel's Avatar
  • Away
  • Platinum Boarder
  • Platinum Boarder
More
9 months 1 day ago - 9 months 1 day ago #18502 by Bill Hertzel
Replied by Bill Hertzel on topic Disconnected Spark Plugs
If the ignition switches at OFF, there will be no spark.

If the switches are ON...
And you are turning the prop by hand at less than a few hundred RPM, there will be no spark. Or, you are turning the prop with the starter, the spark will find a ground somewhere. Not ideal, but not fatal.

If cranking the engine without spark plugs was going to damage the ignition coils, Ignition coils all over the world would need to be replaced every time a spark plug misfired, a plug connector came off, or a plug wire was damaged.

If you want to hand turn the prop with the switches OFF... Go for it!
If you want to crank it with the switches ON, the real danger is YOU getting shocked from the hanging leads.
Last edit: 9 months 1 day ago by Bill Hertzel.

Please Log in or Create an account to join the conversation.